We've been teaching Nordic Walking on Crystal Cruise Ships for 3 years and have exposed over 1,000 people to it! It's complimentary and we use LEKI Instructor poles in 7:30 am and 5 pm classes. We go around the 1/3 mile Promenade Deck on the Symphony and Serenity. nnCrystal is the #1 rated line - period! They care for the health of their guests and Nordic Walking is a perfect way to make room for dessert.